Hi everyone!
It's been a busy few weeks. The borax crystal necklaces are finally complete and home with everyone. Two weeks ago, we explored the pH of common substances with a color changing indicator and learned that foods tend to be sour (acidic) and non-foods bitter (basic).
To show the effects of acids and bases on inorganic and organic material, we examined eggs. The kids first investigated century eggs, which are raw duck eggs that have been cured in lye for several months, then dunked fresh chicken eggs in vinegar to see what happened.
From there we moved on to our own digestive system and how food is processed. The human digestive system contains both acidic (the stomach) and basic (small intestine) sections, as well as a lot of other features shown on the worksheet. Make sure that's finished for next week, when we'll be finishing up digestion and focusing on enzymes.
Also, while not related to our current topic, here's a video of a juvenile (note the mouth color is pink) raven seeking human aid after getting several porcupine spines stuck in its face (ravens enjoy pulling the tails of other animals, which is probably how this happened).
Ravens are very intelligent and can teach their young to distinguish between friend and foe. This raven's parents must have been helped by a human or seen a human helping another raven and taught it to go to humans for help.
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